Sirea Castle is a military site in Aden, Yemen.The citadel was built in the 11th century and is currently used by the Yemeni army.The castle is located on The Island of Sira, a long volcanic rocky island located near the port of Aden.There have been few archaeological studies conducted in the region.One theory is that the castle was built in 1173 by the Turkish ruler of Aden, Prince Osman zangagili of The Tikriti.The castle was established during subsequent attacks against Aden by the Portuguese and Turks especially in 1517.Although the old port began to float and the main commercial centre…